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Employee Benefit and Deferred Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Information relating to the defined benefit pension plan and post-retirement health and life plans | Information relating to the defined benefit pension plan maintained by the Renasant Bank (“Pension Benefits - Renasant”) and to the post-retirement health and life plan (“Other Benefits”) as of December 31, 2018 and 2017 is as follows:
| Pension Benefits Renasant |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017
Change in benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year | $ | 27,859 |  |  | $ | 28,012 |  |  | $ | 1,170 |  |  | $ | 1,566 |
Service cost | — |  |  | — |  |  | 8 |  |  | 9 |
Interest cost | 1,043 |  |  | 1,168 |  |  | 31 |  |  | 42 |
Plan participants’ contributions | — |  |  | — |  |  | 75 |  |  | 77 |
Actuarial (gain) loss | (2,016 | ) |  | 582 |  |  | (239 | ) |  | (328 | )
Benefits paid | (1,941 | ) |  | (1,903 | ) |  | (164 | ) |  | (196 | )
Benefit obligation at end of year | $ | 24,945 |  |  | $ | 27,859 |  |  | $ | 881 |  |  | $ | 1,170 |
Change in fair value of plan assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 26,913 |  |  | $ | 25,241 |  |  |  |  |
Actual return on plan assets | 234 |  |  | 3,575 |  |  |  |  |
Contribution by employer | — |  |  | — |  |  |  |  |
Benefits paid | (1,941 | ) |  | (1,903 | ) |  |  |  |
Fair value of plan assets at end of year | $ | 25,206 |  |  | $ | 26,913 |  |  |  |  |
Funded status at end of year | $ | 261 |  |  | $ | (946 | ) |  | $ | (881 | ) |  | $ | (1,170 | )
Weighted-average assumptions as of December 31 |  |  |  |  |  |  |
Discount rate used to determine the benefit obligation | 4.56 | % |  | 3.96 | % |  | 4.07 | % |  | 3.37 | %
Plan expense for noncontributory benefit pension plan and post-retirement health and life plans | The components of net periodic benefit cost and other amounts recognized in other comprehensive income for the defined benefit pension and post-retirement health and life plans for the years ended December 31, 2018, 2017 and 2016 are as follows:
| Pension Benefits Renasant |  | Pension Benefits HeritageBank(1) |  | Other Benefits
| 2018 |  | 2017 |  | 2016 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8 |  |  | $ | 9 |  |  | $ | 12 |
Interest cost | 1,043 |  |  | 1,168 |  |  | 1,216 |  |  | 172 |  |  | 31 |  |  | 42 |  |  | 58 |
Expected return on plan assets | (2,077 | ) |  | (1,941 | ) |  | (1,872 | ) |  | (113 | ) |  | — |  |  | — |  |  | — |
Prior service cost recognized | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Recognized actuarial loss | 328 |  |  | 401 |  |  | 404 |  |  | — |  |  | — |  |  | 6 |  |  | 76 |
Settlement/curtailment/termination losses | — |  |  | — |  |  | — |  |  | (780 | ) |  | — |  |  | — |  |  | — |
Net periodic benefit cost | (706 | ) |  | (372 | ) |  | (252 | ) |  | (721 | ) |  | 39 |  |  | 57 |  |  | 146 |
Net actuarial (gain) loss arising during the period | (173 | ) |  | (1,051 | ) |  | 5 |  |  | (397 | ) |  | (240 | ) |  | (328 | ) |  | (56 | )
Net Settlement/curtailment/termination losses | — |  |  | — |  |  | — |  |  | 780 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial loss recognized in net periodic pension cost | (328 | ) |  | (401 | ) |  | (404 | ) |  | — |  |  | — |  |  | (6 | ) |  | (76 | )
Total recognized in other comprehensive income | (501 | ) |  | (1,452 | ) |  | (399 | ) |  | (383 | ) |  | (240 | ) |  | (334 | ) |  | (132 | )
Total recognized in net periodic benefit cost and other comprehensive income | $ | (1,207 | ) |  | $ | (1,824 | ) |  | $ | (651 | ) |  | $ | (338 | ) |  | $ | (201 | ) |  | $ | (277 | ) |  | $ | 14 |
Weighted-average assumptions as of December 31 |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used to determine net periodic pension cost | 3.96 | % |  | 4.35 | % |  | 4.56 | % |  | 4.27 | % |  | 3.37 | % |  | 3.57 | % |  | 3.63 | %
Expected return on plan assets | 6.00 | % |  | 8.00 | % |  | 8.00 | % |  | 3.00 | % |  | N/A |  |  | N/A |  |  | N/A |
(1) | Because the final distribution of benefits under the HeritageBank of the South Defined Benefit Plan was completed in 2016, there was no impact on the Company’s consolidated financial statements as of and for the years ended December 31, 2018 and 2017.
Future estimated benefit payments under the defined benefit pension plan and post-retirement health and life plan | Future estimated benefit payments under the Renasant defined benefit pension plan and post-retirement health and life plan are as follows:
| Pension Benefits Renasant |  | Other Benefits
2019 | $ | 1,968 |  |  | $ | 156 |
2020 | 1,973 |  |  | 141 |
2021 | 1,988 |  |  | 126 |
2022 | 1,980 |  |  | 103 |
2023 | 1,958 |  |  | 101 |
2024 - 2028 | 9,277 |  |  | 279 |
Amounts recognized in accumulated other comprehensive income, net of tax | Amounts recognized in accumulated other comprehensive income, before tax, for the year ended December 31, 2018 are as follows:
| Pension Benefits Renasant |  | Other Benefits
Prior service cost | $ | — |  |  | $ | — |
Actuarial loss (gain) | 9,562 |  |  | (155 | )
Total | $ | 9,562 |  |  | $ | (155 | )
Estimated costs that will be amortized from accumulated other comprehensive income into net periodic cost | The estimated costs that will be amortized from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year are as follows:
| Pension Benefits Renasant |  | Other Benefits
Prior service cost | $ | — |  |  | $ | — |
Actuarial loss (gain) | 345 |  |  | (56 | )
Total | $ | 345 |  |  | $ | (56 | )
Fair values of defined benefit pension plan assets by category of the firm |
| Quoted Prices In Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at NAV |  | Totals
December 31, 2018 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 40 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 40 |
Investments in collective trusts | — |  |  | — |  |  | — |  |  | 25,166 |  |  | 25,166 |
| $ | 40 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,166 |  |  | $ | 25,206 |
| Quoted Prices In Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Measured at NAV |  | Totals
December 31, 2017 |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | 387 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 387 |
U.S. government securities | — |  |  | 2,496 |  |  | — |  |  | — |  |  | 2,496 |
Corporate debt | — |  |  | 1,908 |  |  | — |  |  | — |  |  | 1,908 |
Corporate stocks | 20,557 |  |  | — |  |  | — |  |  | — |  |  | 20,557 |
Investments in registered investment companies | 921 |  |  | — |  |  | — |  |  | — |  |  | 921 |
Foreign obligations | — |  |  | 644 |  |  | — |  |  | — |  |  | 644 |
| $ | 21,865 |  |  | $ | 5,048 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,913 |
Summarizes information about options issued under the long-term equity incentive plan | The following table summarizes information about options outstanding, exercised and forfeited as of and for the three years ended December 31, 2018, 2017 and 2016:
| Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life |  | Aggregate Intrinsic Value
Outstanding at January 1, 2016 | 621,446 |  |  | $ | 17.88 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (435,177 | ) |  | 18.67 |  |  |  |  |
Forfeited | (644 | ) |  | 29.67 |  |  |  |  |
Outstanding at December 31, 2016 | 185,625 |  |  | $ | 15.97 |  |  | 3.91 |  | $ | 4,872 |
Exercisable at December 31, 2016 | 185,625 |  |  | $ | 15.97 |  |  | 3.91 |  | $ | 4,872 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (95,875 | ) |  | 16.25 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Outstanding at December 31, 2017 | 89,750 |  |  | $ | 15.67 |  |  | 3.14 |  | $ | 2,263 |
Exercisable at December 31, 2017 | 89,750 |  |  | $ | 15.67 |  |  | 3.14 |  | $ | 2,263 |
Granted | — |  |  | — |  |  |  |  |
Exercised | (41,000 | ) |  | 15.54 |  |  |  |  |
Forfeited | (5,000 | ) |  | 15.32 |  |  |  |  |
Outstanding at December 31, 2018 | 43,750 |  |  | $ | 15.84 |  |  | 2.63 |  | $ | 627 |
Exercisable at December 31, 2018 | 43,750 |  |  | $ | 15.84 |  |  | 2.63 |  | $ | 627 |
Summary of the changes in restricted stock | The following table summarizes the changes in restricted stock as of and for the year ended December 31, 2018:
| Performance- Based Restricted Stock(1) |  | Weighted Average Grant-Date Fair Value |  | Time- Based Restricted Stock |  | Weighted Average Grant-Date Fair Value
Not vested at beginning of year | — |  |  | $ | — |  |  | 218,075 |  |  | $ | 39.08 |
Granted | 110,652 |  |  | 40.89 |  |  | 188,272 |  |  | 42.93 |
Vested | (66,338 | ) |  | 40.89 |  |  | (75,829 | ) |  | 36.98 |
Cancelled | (3,014 | ) |  | 40.89 |  |  | (25,563 | ) |  | 40.97 |
Not vested at end of year | 41,300 |  |  | $ | 40.89 |  |  | 304,955 |  |  | $ | 41.82 |
(1) In January 2018, the Company awarded an aggregate of 53,883 shares of performance-based restricted stock (at the target level), subject to a one-year performance cycle. An aggregate of 3,014 shares was forfeited and canceled prior to the end of the performance cycle. The Company's financial performance exceeded target levels, increasing the award by an aggregate of 15,469 shares.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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